This seems to be a pre-existing and essentially unrelated bug. The same
problem occurs for:
constexpr int &p = S::q.r;
I think we should be looking at the linkage of the extending declaration when
picking the linkage for a lifetime-extended temporary. (If the extending
declaration is externally visible, I think the temporary should be
`linkonce_odr`.)
http://llvm-reviews.chandlerc.com/D1982
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